Phase transformations in the nickel phosphide system induced by transition-metal doping and their electro-catalytic study

Ayom, Gwaza Eric; Khan, Malik Dilshad; Masikane, Siphamandla C.; Souza, Felipe de; Wang, Lin; Gupta, Ram K.; Revaprasadu, Neerish

doi:10.1039/d1se01866c

Cited by 7 publications

(15 citation statements)

References 61 publications

(98 reference statements)

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“…For example, the performance of our catalysts also compared well to that of Ni 2 P and Ni 5 P 4 obtained by the decomposition of Ni(CH 3 COO) 2 • 4H 2 O in TOPO/TOP or hexadecylamine/TOP that required overpotentials of 146-203 mV to reach a current density of 10 mA/cm 2 in 1 M KOH. [3] Table S3 gives highlights of the HER performance of our catalyst in comparison to other electrodes formed via non-colloidal and colloidal routes.…”

Section: Hydrogen Evolution Reaction (Her)mentioning

confidence: 99%

“…It is important to note that the slight undulations observed in some of the CA measurements (Figure 12) are due to the bubbling O 2 that is common to the OER process. [3] To understand the charge transfer properties of our catalyst affecting the OER performance, electrochemical impedance spectroscopy (EIS) analysis was performed at different poten- tials. The EIS measurements obtained in the form of Nyquist plots (Figure 13) were obtained by applying an alternate current amplitude of 10 mV over a frequency range of 0.05 Hz to 10 kHz.…”

Section: Oxygen Evolution Reaction (Oer)mentioning

confidence: 99%

“…Nevertheless, water-splitting reactions are constrained by reaction sluggishness due to the thermodynamic stability of water molecules. [3] Noble metals like Pt and Ir have been documented as efficient catalysts for water-splitting reactions with ultra-low overpotentials. [4] However, the cost and scarcity of noble metal catalysts are hurdles to commercializing water-splitting technologies.…”

Section: Introductionmentioning

confidence: 99%

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Metal−Organic Precursors for Transition‐Metal‐Doped Ni₂P via Pyrolysis for Efficient Overall Water Splitting and Supercapacitance

et al. 2023

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The synthesis of solvent‐less bare‐surface nickel phosphides is desired, considering their superior electrocatalytic properties and straightforward synthetic protocols compared to their analogues prepared from colloidal routes. Herein, we report the synthesis of [Ni{S2P(OH)(4‐CH3OC6H4)}2] (1), [Fe{S2P(OH)(4‐CH3OC6H4)}3] (2) and [Co{S2P(OC4H9)(4‐CH3OC6H4)}3] (3) and their utilization to form Ni2P, Fe‐Ni2P and Co‐Ni2P in a solvent‐less pyrolysis method. This solvent‐free protocol involved the decomposition of complex (1) and the composites of complex (1) with (2) or (3) in the presence of triphenylphosphine (TPP) at 400 °C for one hour. The solvent‐less decomposition of complex (1) without TPP formed nickel sulfide. A plausible explanation for this rare fabrication of pristine and doped Ni2P in the absence of any solvent is suggested. All the transition metal doped phosphides improved the HER performance of pristine Ni2P, with the 5 % Fe doped Ni2P having the best performance, requiring 137 mV to reach a current density of 10 mA/cm2. Similarly, the OER performance of un‐doped Ni2P was improved by all the doped Ni2P catalysts, where 10 % Fe‐doped Ni2P showed the best performance requiring 326 mV to reach a current density of 10 mA/cm2. Transition metal doping was also shown to improve the reaction kinetics, stability and durability of the solvent‐free prepared Ni2P.

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Section: Hydrogen Evolution Reaction (Her)mentioning

confidence: 99%

Section: Oxygen Evolution Reaction (Oer)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metal−Organic Precursors for Transition‐Metal‐Doped Ni₂P via Pyrolysis for Efficient Overall Water Splitting and Supercapacitance

et al. 2023

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“…[38] The type of surfactants used may also affect the response's vigor and favour the creation of certain stages. [39] There have been few promising catalytic demonstrations of metal chalcogenides. Oxidation/reduction reactions and (electro) catalytic activity have advanced by varying the oxidation states and they have the capacity to be applied mechanically on a large scale.…”

Section: Ligand Supported Transition Metal Chalcogenidesmentioning

confidence: 99%

“…A colloidal approach based on surfactant‐aided scatterings and electrostatic intelligence between oppositely charged surfaces effectively gathered nanocomposites of multi‐walled carbon nanotubes and TMDs [38] . The type of surfactants used may also affect the response's vigor and favour the creation of certain stages [39] . There have been few promising catalytic demonstrations of metal chalcogenides.…”

Section: Substrate‐supported Transition Metal Chalcogenidesmentioning

confidence: 99%

Multifunctionalized Metal Chalcogenides and Their Roles in Catalysis and Biomedical Applications

et al. 2022

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Chalcogenides are more frequently used to refer sulfides, selenides, tellurides and polonides rather than oxides and all the elements in group 16 of the periodic table are chalcogens. The synthesis of transition metal chalcogenides (TMCs) and their composites involved a wide range of techniques like one pot heat up, hydrothermal, solvothermal, precipitation, co‐precipitation and biological procedures. In light of the possibility of photo‐induced charge‐transfer events leading to intra‐ensemble charge separation, the integration of TMCs onto a strong electron‐accepting material such as graphene which provides unique TMC/graphene consisted of great significance. Electrochemical water splitting is a promising technology for converting, storing and transporting hydrogen energy in a sustainable manner. Because of their unique physical and chemical properties, as well as their low cost, transition metal chalcogenides are fascinating replacements for catalysts in catalytic water splitting. Transition metal chalcogenides have worldwide attention in recent decades due to their applications in chemical sensors, biological and environmental monitoring applications from biosensors to therapeutic treatment agents.

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Self‐Supporting Iron‐Modified Nickel Phosphide Electrode Realizing Superior Bifunctional Performance for Water Splitting

Chen

et al. 2023

ChemCatChem

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Utilizing non-noble metal-based materials to design highly active and low-cost bifunctional electrocatalysts play a vital role in oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) for the overall water splitting. Herein, a selfsupporting nickel phosphide electrode with the decoration of FeOOH species is successfully prepared by a simple electrodeposition and maceration drying process. This kind of electrode exhibits superior bifunctional activity for both HER and OER. Benefiting from the more exposed catalytic active sites, open hierarchical structure, and better reaction kinetics.At the current density of 100 mA cm À 2 , the optimal Ni 2 PÀ FeOOH/NF delivers the small overpotentials of 200 mV and 235 mV for HER and OER in an alkaline solution, respectively. After further assembling into the electrolyzer, the Ni 2 PÀ FeOOH/NF-based device shows a lower cell voltage of 1.5 V and 1.66 V to reach the current density of 10 mA cm À 2 and 100 mA cm À 2 , along with superior stability. This work outlines a promising strategy for the facile preparation of self-supporting electrodes for practical application in hydrogen generation by overall water splitting.

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Phase transformations in the nickel phosphide system induced by transition-metal doping and their electro-catalytic study

Abstract: The synthesis of pure-phase nickel phosphide is of immense interest due to its wide scale applications in various electrocatalytic reactions. We report the facile synthesis of nickel phosphides and rare...

Cited by 7 publications

References 61 publications

Metal−Organic Precursors for Transition‐Metal‐Doped Ni₂P via Pyrolysis for Efficient Overall Water Splitting and Supercapacitance

Metal−Organic Precursors for Transition‐Metal‐Doped Ni₂P via Pyrolysis for Efficient Overall Water Splitting and Supercapacitance

Multifunctionalized Metal Chalcogenides and Their Roles in Catalysis and Biomedical Applications

Self‐Supporting Iron‐Modified Nickel Phosphide Electrode Realizing Superior Bifunctional Performance for Water Splitting

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Phase transformations in the nickel phosphide system induced by transition-metal doping and their electro-catalytic study

Abstract: The synthesis of pure-phase nickel phosphide is of immense interest due to its wide scale applications in various electrocatalytic reactions. We report the facile synthesis of nickel phosphides and rare...

Cited by 7 publications

References 61 publications

Metal−Organic Precursors for Transition‐Metal‐Doped Ni2P via Pyrolysis for Efficient Overall Water Splitting and Supercapacitance

Metal−Organic Precursors for Transition‐Metal‐Doped Ni2P via Pyrolysis for Efficient Overall Water Splitting and Supercapacitance

Multifunctionalized Metal Chalcogenides and Their Roles in Catalysis and Biomedical Applications

Self‐Supporting Iron‐Modified Nickel Phosphide Electrode Realizing Superior Bifunctional Performance for Water Splitting

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Product

Resources

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Metal−Organic Precursors for Transition‐Metal‐Doped Ni₂P via Pyrolysis for Efficient Overall Water Splitting and Supercapacitance

Metal−Organic Precursors for Transition‐Metal‐Doped Ni₂P via Pyrolysis for Efficient Overall Water Splitting and Supercapacitance